burke



.(No l lodel.) 2 Sheets-Sheet 1 O. G. BURKE.

Telegraph Sounder. No. 240,006. Patented April 12,1881.

N. PETERS, PriQTQLITHOGRAPHER, WASHINGTON. D c

3 its upper surface.

40 shown.

UNITE STATES PATENT OFFICE.

CHARLES Gr. BURKE, OF NEW YORK, N. Y.

TELEGRAPHIC SOUNDER.

SPECIFICATION forming part of Letters Patent No. 240,006, dated April 12, 1881.

Application filed February 4, 1881. (No model.)

To all whom-it may concern:

Be it known that I, OHARLEs G. BURKE, of the city, county, and State of New York, have invented a new and useful Improvement 5 in Telegraphic Sounders, of which the following is a specification.

The object of myinvention is to furnish and to render of practical utility an armature which, by the nature of its construction and the pe- [O culiarity of its combination with an electronet by which it has been attracted is interrupted or ceases.

The following is a full, clear, and true description of my invention, reference being had to the drawings herewith accompanying and forming a part of this specification.

Figure 1 is a side view of a tGiGgFEIPIl-SOllllder containing my improvement. Fig. 2 is an end view of same on the line X, Fig. 1. Fig. 3 is a top view of Fig. 1. Fig. 4 is a side View of a portion of Fig. 1, and showing an armature hinged or pivoted at one end. Fig. 5 is a top view of Fig. 4.. Fig. 6 is a side view of a telegraph-sounder having my improved armature, without the usual cross-bar or armature-lever, such armature lying in its box or frame, the inverted impending electromagnet being placed longitudinally above it, so that the lower surface of the helices of mag net M M come in. line with and directly over Fig. 7 is a top view of the armature shown in Fig. 6 and the outline of the combined impending electro-magnet.

Referring to Fig. 1, M is an electro-ma-gnet, suitably attached to its frame or support, as

Through this frame and in its four respective corners, through suitable holes, freely pass four posts or pins, forming the support of the top piece of the instrument and rigidly binding it to the bottom plate or base. The

5 magnet frame or support is held in its place by the screw D and the four posts or pins passing through it, by which screw the said frame and the magnet attached may, at will, be raised or lowered, the holes through which the four posts or pins pass being of sufficient size to admit of a free and steady movement upward and downward for such frame and magnet attached.

D is an ordinary adjusting-screw.

S is one of the ordinary wire-receiving posts, for the purpose of effecting the usual electrical connection, and is of usual material and construction.

C is the armature box or frame, of suitable material, which contains the armature, and this box or frame, with the armature contained therein, is so constructed that it may readily be slid under and withdrawn from beneath the impending magnet M.

B is an armature, of suitable material, having the usual arm or cross-piece, A.

P are pillars or pins rigidly fixed in and becoming part of the frame 0. These pillars or pins pass freely through suitable holes in armature B,their object and use being to insure the steadiness in the upward and downward motion of the armature B. The top of the frame 0 is so constructed that the lower surface of the helices of magnet M may be brought into correct and intimate electric relation with armature B, but not in contact therewith.

The operation of the foregoing-described instrument is as follows: Magnet M having been brought into correct attractile relation to armature B and the usual electrical connections being made, magnet M becomes magnetized and immediately attracts armature B, which thereupon slides up on pins P, its upper surface comingin contact with the lower orinner surface of the top of the armature-box O, the impact therewith producing such a sound as the nature of the material of the striking or impinging surfaces will admit of. So long as magnet M remains magnetized and its attractile force is sufficient to hold the attracted armature B, so long will armature B remain in contact with the top of box 0. NVhen the magnetization of magnet M is interrupted or ceases, then the armature B, being no longer attracted and being free to slide back on pins P, will immediately and by its own weight fall to the bottom of box 0 or the stop placed to receive it, producing by such fall and its coming in contact with the bottom of the box 0 or the stop placed to receive it such a sound as the nature of the material of the strikingsurfaces and medium of vibration will admit of.

In Fig. 6 it will be seen that the magnet M M is placed lengthwise or longitudinally over armature A, such armature being without the usual eross-piece or arm, and that the lower surfaces of the helices of magnet M M are placed directly over, but not in contact with, the underlying top surface of armature B, such surface being of a material admitting of a free attraction. Armature B may slide on pins, as shown in Fig. 1, or in grooves fitted to its shape, as in Fig. 7, such arrangements being equivalents, preference being given'to that form which will insure the least amount of friction.

It will be readily seen from the foregoing description and the drawings herewith that in my invention the armatureis confined to a distinct box or frame, and that its movement is upward and downward, the range of such movement being limited by the height of the interior of the armature box or frame and the upper surface of the armature, and has little or no lateral motion.

It will also be observed that the upward movementis effected or caused by the attractile force of the impending electro-magnet, with which it is combined or brought into relation, and that its downward movement is the result of its own gravity or weight, and entirely without the aid of any mechanism.

It will further be observed that a cross-piece or armature-bar is not essential to its correct operation, and that the usual hinge or pivot may be entirely dispensed with.

It is further shown that, the upper surface of an armature arranged as shown in Fig. 6 being always in a plane parallel to the lower surfaces of the helices of the impending electro-magnet, the power of attraction and the movement of the armature toward its source of attraction will be uniform and proportionally equable.

It will also be observed that, the armature frame and the armature placed therein being capable ofbein greadily slipped under and withdrawn from beneath the impending magnet, armature S, differing in weightand producing "arietyin tone by change of the nature of the striking-surfaces, may be practically used in combination or connection with the same electro-magnet in the same instrument, and securing thereby the utilization of the varying conditions of electric currents and satisfying any necessary demand for readily distinguished difference in sound.

Having thus described my invention, what I claim, and for which I desire Letters Patent,

1. A circuit breaker or sounder consisting of an armature, with or without an armaturelever or cross-bar, having a confined, limited, and fixed range of steady movement upward and downward within a suitable frame or box, such armature sliding freely in grooves or slots adapted to its form and shape in such frame or box, or on pins affixed to and forming part of such frame or box, and passing freely through suitable holes in such armature, the upper movement or motion of said armature being effected by the attractile force of a magnetized inverted impending electro-magnet attached to a suitable frame or support and placed in electric relation with such armature, such frame or support and the magnet thereto attached being capable of being raised from and lowered to such armature by a suitable screw or its equivalent, and the downward or return movement of such armature resulting from its own gravity or weight when the power of the magnet by which it has been attracted and raised is interrupted or ceases, substantially as described, and for the purposes specified.

2. An inverted impending electro-magnetattached to a suitable frame or support and capable of being raised and lowered by a screw or its equivalent, in combination with an underlying armature confined to an armature box or frame and having a limited fixed range of steady and free movement upward and downward within such box, the plane of its upper surface being parallel, when at rest and in motion, with the under surfaces of the helices of the attracting magnet, substantially as described, and for the purpose specified.

Witness my hand this 31st day of January, 1881.

CHARLES G. BURKE.

Witnesses THEO. G. Hosrnu, CHAS. R. CLARKE. 

